Knowing a friend's partner and seeing that they seem to have merged with that person can generate some envy. Seeing this is a step back in your evolution, since that type of couple is precisely the ideal example of the kind of partner you are looking for.
If you stop to think about it, the reality is that your day to day life may not be as idyllic as it seems. This sentence: "tell me what you boast about and I'll tell you what you lack", can take a special role in this kind of relationship.
The truth is that to see yourself too reflected in someone can end up turning yours into a competition, a situation that you don't want to live under any circumstance.
You could save more than you think if you wanted to. It seems you're missing opportunities that are coming your way. At your disposal you have some tools that would help you achieve your goal in this aspect if you posed it.
In a world like the present one it seems that everything is invented, and indeed there are techniques designed to make the most of our profits. You can talk to a financial advisor or look for information on the Internet on this subject, you will be surprised by the amount of possibilities that exist.
In fact, you may even be surprised to discover that there are people who, with a salary lower than yours, get much more out of it.
Having the feeling that you have made mistakes is something that can cause you to have your mind down. This is because you're a perfectionist: sometimes it seems that you never have enough.
Be satisfied with the idea that you have been able to detect those errors and remedy them. It's not smarter who is never wrong but who is able to react to any situation.
The reality is that in your life you do more things well than you think, list all those things that you feel proud and satisfied of.